As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OMA - FLT 5721 - AIRCRAFT RETURNED TO FIELD AT OMA WHEN AFT CARGO DOOR AJAR LIGHT CAME ON AFTER TAKEOFF. MAINTENANCE CONTROL DEFERRED IAW MEL AND WAS RETURNED TO SERVICE. MAINTENANCE ADJUSTED DOOR AJAR SWITCH SYSTEM, OPS CHECKED NORMAL.